[Hibernate-issues] [Hibernate-JIRA] Created: (HHH-1564) Possible bug with deleting versioned object (patch included)

[N C. (JIRA) <no...@at...>]

Possible bug with deleting versioned object (patch included)
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         Key: HHH-1564
         URL: http://opensource.atlassian.com/projects/hibernate/browse/HHH-1564
     Project: Hibernate3
        Type: Bug

  Components: core  
    Versions: 3.1.2    
 Environment: 3.1rc2
    Reporter: N Clayton


We're seeing an odd problem when trying to delete a row. The code that does this simply creates a new object, commits it, starts a new session, finds the object, deletes it. It dies with a constraint violation on an audit table, because hibernate is issuing an unnecessary update operation (and not incrementing the version either). Further debugging shows that Hibernate thinks that three properties on the object are 'modified'. These three are collections. One is the points collection, one owners and the other is systems. Hibernate seems to think that they are 'different' because null != an empty collection. So, it thinks it needs to update the object.  However; later on - it doesn't increment the version number - because it knows the object is to be deleted. Thus - a problem. 

A complete description is here:
http://forum.hibernate.org/viewtopic.php?t=950225&highlight=collectiontype+isdirty

This appears to be fixed if we change CollectionType.isDirty() to be:

   public boolean isDirty(Object old, Object current, boolean[] checkable, SessionImplementor session)
         throws HibernateException {
        if(checkable.length == 0) {
            // Assume not checkable
            return false;
        }
      return isDirty(old, current, session);
   } 

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